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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369298b7ff7da1f35874dd5cf68fe45208c6b1465dc3b39afefd1b7a9f6f9448' 
  AND token = 'cJ94L5oBt2e10GH1B39IaPT8R9Nz/lNAQN1+F9CzwWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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