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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfe936ad1396b44524033205115174d7247c941f4097055300e569111cabc9e' 
  AND token = 'UtIgN7v54u2nOeSUx1r4jj8CoVT1/1tLEtB4DQqUo2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}