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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77b7d6ce2891617499af9ab9e6d9040d35ba699c67503d6f31354f2cb58a0dc' 
  AND token = 'iLPNtEhAT12BTNwXdfYmcFSPlbMAAseIq/R1J7kF6KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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