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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cfbcb45af76c843c974d78173de5bfaa8e0a122c1ae735305c345eb0ffd3f9' 
  AND token = 'DrIu7ZkOMD8HRB5Ze08VLEKzSlzcCcGCPKy5ALviTGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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