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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c294ce57412ef945e50d163e73fac206ebfeb4aaba8da95d4089397413b6310' 
  AND token = 'OUSPgPjLvuvJevLHc5BhDyc8LiEqM5zbetWL7I3Yo0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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