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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0386486c439e4592ea6d74d72dec6111b90ccf2db73ff498e2c664c08e12c8ea' 
  AND token = 'mw/CCLfgkih/zzzInJx9swtfWZ8Woay88ZX+PY3i7Mw=' 
  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"
    }
  }
}