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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d52b01e68b22aa1a045932f1b27a9d691d5195e500c78176934defed056d519' 
  AND token = 'Y03j+deqZjxNNcNjaf3yjaQxATB/zsiFfDy4b3tj8vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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