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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c524d8a0a1d49b3064407ca8be29c73fbdd54ada7b71c01f9b1454af358e47' 
  AND token = 'GoVXuEb3IuFYWOGDx5rsFvGpZMa9QHAajCzAVu0PmQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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