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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f93539b136791c0d16b89d68deb2d5514bb81828e5bec9e8b305c4b81395ec5' 
  AND token = '4J6UcUva1vvWmW1yrHYZJp3wtgbbKPcQyCULgHAWDYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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