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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435478a4d5cd7dcb73b1660c7f29d7eb52ad362e74aef1e80311bd6635f7b56a' 
  AND token = '2UJZ+YJHfxrE0fBssp98/vX7idVLmlv0B+bo6aHWZVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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