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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f21d9cdc62439f0ec9f739fd56eff2dc056f710bdb7d270151c9d7df4133ca' 
  AND token = '9o/DD0bkjy/K2OgsfU2um0S2JOTdYrqoJdRPHTtlrHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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