SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963cb24749144036811443abeea80e92cf067da4857be06fe91168d55ec0fac5' 
  AND token = 'w/b+mNuPfjSQSTDG8rYUx7Q8X2jQmvWmtpiXHqzWLLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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