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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978c77ac911941bb58bf37a83059e3fb2553f929517b29f185b0f508959e674f' 
  AND token = 'L3FggEi30oyeuuUkcZt1eeZ98USEEcLguikFzQcXAsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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