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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2851c60b8c90f8635b13f622e385d065d2d0a0fc4ed6cedd71baaf91f0b8316b' 
  AND token = '4lfTf6b+bdCOvFtchJi1kDBcTMq0yMI6STeN7gOjL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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