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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b65f97ca731a243de0ff6def70a6c6588a2a75e5f8366979a037c9fcdaff3a' 
  AND token = 'qtdfx5cr60WyR65Quz4GOmskM/ZW+c6FN5IhJ2c2yQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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