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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc47f1572b90ebcac7a95dfb7ee3c7404bce310be8fc33b88bb37efe5ee9803f' 
  AND token = 'dplhijRcgF6KADsM/NqWmmvg26TxYAGwyNSm/Jr1+1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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