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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899bdb9a8f954493376edc450a8e131dae08616ead6cd3512c4d8ae6a1aac662' 
  AND token = 'h+5jnkYhTo4ak+nuoouC35i/xyxGfh29vGvBiWT6jvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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