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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb486eb5619e6546c149496930eb0a1b1ed2ce40c1a86e4341ab84a2bc75f9a' 
  AND token = 'YvqiQR8SQHkZHpmFqY49qkyQrnz/NHBLpX9mIr0h9c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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