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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8df7901bfc4b5193d2b8639a3bddf83148cd59a41bc19a44acbf9e0e018e55' 
  AND token = 'l+oafYS34yC8WVDktlPyZ4X/iK3CXwwRTc7hxgSTZt0=' 
  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"
    }
  }
}