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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00500ade6a3e22d956c554772157d3d64f22351d684ded25e5273aa131e11b77' 
  AND token = 'mERdKrkg0K+J5ZZiZXih0dyTx7taNJR1X0Ss5bvcVzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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