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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b554e6b2229300881098aab888ed0c92e8b4ec7ddef6a36bdf936f22e5c455a3' 
  AND token = 'LprAmkep7LkaHEs+M1eNldRvzBmB8woAn0j/GNtcO/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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