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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072ab6520fff310ab480676ef6b11956eeb649d6385cbd54086304d2f898c287' 
  AND token = 'WtVcacspJvFwzvVUlB7Z2eem0o682xNOrX9VwS7Cpdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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