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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2038460e9c40b166e06a53f85a6d1a0e2e4c5a372d8ca0fa182837bb6a7a6485' 
  AND token = '/GbDgq0P2LBtdenk1hx8Isqnp1yHBTpQUyts5Pp/aqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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