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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d61ac50d10d163f6d6b07cd28e883bcaa5c79f083b181907130b89a9523656' 
  AND token = 'V9yAZlR18yfxQ3hC4odr8+4HX0psdIfaAMjYw7qJdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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