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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f1627d2ad21cde27ded15e570f2bb82024cdfa5e5ef42b517a3ef88a5f622d' 
  AND token = 'jg7YAh/8ywT+pxKfJFZgtp14DWY3SQC2u4p729eSGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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