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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4ffc4881834044963ca886b3edb93a52933b4ac392318ca8c0161628b1d542' 
  AND token = 'NbrcIwQO2D9kxM4SUw6amUWlS6Rs8mjx2WlS2FhJxyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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