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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05664d1cc56503f4184307f3f445c3b70f2c8659128cc2dcf14833412f9e2d8d' 
  AND token = 'L/6368Njz1sllzw7sIX3o7mgGVNnoYAz7HxV7DCLxms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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