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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0281b438dfa1c5a8108bf68c1b81a6cf43f8e0bb10bd5c6b2fd8c65f1ab9518c' 
  AND token = 'ISrXk52JP/HVV+8iWe0slE925b8/iu11dCyPcE86kF4=' 
  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"
    }
  }
}