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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50006390d68d5a832528b5e4e14663d4d7323c30f3ba4a60e99be0eee0e01c8b' 
  AND token = '04vhRIAJm3CnF1mI3ud6tAScTy+k4BKXORRwr31OHio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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