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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a92eb712a51e6915034c2f2fb35683fc4065b6e33eec64ce405a3657a74a7e' 
  AND token = 'TYvB/ay4uDVNcgd1WKNatvMxwZpkpTqMB5mYBqQHCPw=' 
  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"
    }
  }
}