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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b1a53d2ad16a3e7d11d3a9b936025bb4a14cfb02ac25ec459cc3e26f594680' 
  AND token = '6MH01EmQuB0EanZik0V42Vd78/U65FcGHmQZXeJZqYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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