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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e2fa6978fd2478f9b313283303c68d060ffa4d6e9f6a747984f9ab4df00847' 
  AND token = 'scdC2euZ9qRaCUQtHc+W3HlwC5jY4RSPCmlQa6gnbv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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