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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216a9766ee8f63a057af165e4773f13f93a339f0065f5a203530cbf7a5f5b44e' 
  AND token = 'RpIMC/P8NWV//SEQzY5BdNPsE4rorl3yu7L7AuZCmrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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