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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04942f974b4327067bf15d75864598306496b5f5d75382f579fd598d635054bc' 
  AND token = 'FS0GJtekvPSODe4H2txfwrYdSWU3dSlVBEamfMtg1iY=' 
  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"
    }
  }
}