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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9a6352fd3995c226acb4219c78c72e68c3b6126b3bdccdbc5da81e3040b0ed' 
  AND token = '7kq5T+h1p0QBFZNz7fDxRqRec/xnmHmyj/A8dOU3aVI=' 
  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"
    }
  }
}