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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22fd9bc82ba14d08f9c686eb230532e4d495a13fbecb0d9b370fccb3f1f9183' 
  AND token = 'D8Z1XT2K6HLHN82Ux0nCTwROYA2sFIWpg0nu1BMnNc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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