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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2823cf1cd5eb896158408bd8abd0405bd04d9d6b3d43cfd9359ca179009eb746' 
  AND token = 'ElC51xl1hjUTB9LfBbMd9FxzS5Dj1T+NC5aC9nSSZYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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