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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123fa9eb934a3532f0682e004243fd5c1ea990e23bbecd68d6d6bd92d72bde4c' 
  AND token = '/W9SwN9b4wLWWlwL9uE649baJZpFKdm/nOkrXDFlfB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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