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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860e1cc615a7df63bf3817dac0fadff12d24bf7a3d0d8fd33276bc48dbced767' 
  AND token = 'otZu3z+7+b1b4+zObCDWRgHSfBFW8zUoxlz4I1TmPNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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