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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b89c687f54fb86a4e2480b3df9e4ab8c9ac89576a431572c1b44fd2ab55507c' 
  AND token = 'EVROR4Bfs9xot3vo1KVO3yQPcujWO79UFJ4r3cmPcXA=' 
  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"
    }
  }
}