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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a302d9b908549a5d7e59306da4041e648a6e3d004526863ea3df52133ecd3c6c' 
  AND token = 'uTarrdRRKr30nvXP1mVcNGO/5m5YCWbX5Vj6j4xOXjU=' 
  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"
    }
  }
}