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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e3e940a2d5488ee7f29e8190580814260119c1229e9c7b5ef32be85a342e91' 
  AND token = '9GfZbH3NchitUV2xPK4zjlIB3TyKbh4nkxyfQiNuMpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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