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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a77bb4408c7b7acd8771ea90afbd899e8de927ba8ddb4b1c86abaa76990914' 
  AND token = '0KmDs2S4Zkg1Z0gi7pp/XI5SUDyXKk5V5yAEmyYM9rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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