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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e597a01faf316d939375c1c164e4d65492b03e9f03328a0d7e3ebf17a469c2e6' 
  AND token = 'hr706gbteaVZlpE3J2QFjZydgw01FlcSg7xAHfBoeOU=' 
  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"
    }
  }
}