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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a982abc6b2ecb60b4bd1a187a79e1896b6b4506c9d5134df89d2822aa389ee' 
  AND token = 'QA4SVu3G4hO+UMvHTzuZLBTs/yUXABXrDc3RqbAWnOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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