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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36a0a01b7ba75119592b17c7055a3152c8f0e51eeabc83eee8eafda4e22d413' 
  AND token = '3bb0vh2oB1zfu1kmlzwqpVXs9Qexl/gUY8d63sIUP6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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