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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e831a6e5cdd381c9302b0369c79cc979560e4483278fa5635db0b5248f62e7' 
  AND token = 'zN13dZRFJ5W48kdzRuYjhz/McGK6V3V8jIghRaV8PAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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