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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688b832c18eb6b491772b1555cc3cb555976b9c225313e07e6c82f207379774f' 
  AND token = 'MnXilPFxqHUHqEfFYQGrl8ofRlvEVO+mc7VZ1c1dF6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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