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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12eef343c5ac19e03befe90b29189cd41fcbd8370d80151a2d855ed27bc0e0ee' 
  AND token = 'YNVNDKHU1Z4uLtFz9jVZ3sdUATrUef24MeLwDOmO3tY=' 
  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"
    }
  }
}