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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1260a266a41119d2a4290e158adfd1c00a9d3802629af896a2c35cce04a76e41' 
  AND token = 'TV3qrhlbVIwJjCGn8J3VKbrcWQHT0wW8zrxb8+61n/Y=' 
  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"
    }
  }
}