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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0f9cccd649957500c35d5fbad96e610eb0412ac9822605debfebe0c683a940' 
  AND token = 'w8g9o1QpoUBI8ZoZ+fgcgMTvW6hRaB2Z0KbePoDSmlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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