SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6627dca67c73e42a2b9f0846a8a6621a0f5453947f92ac7d85dc1c1b117adc' 
  AND token = '+MRbvyJHX8rZGwNV0Pq3obmochGCnws01YFjanscANI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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