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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805ef9bdb334222e95f3956406404b1dbba13c8c372c9d2b18bce2523cc426c3' 
  AND token = 'mv4GJTQCvkxvKPJS+JK/AlcvP2oKwXxZcN5lLPb3gZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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