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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b28e9d3ef95c5673b5f44c830f60e1baf01c188446bf5e1ef6dc08a9a993999' 
  AND token = '4QLVX5mNIce1/1uMuzEUQWkKijW9oXanDJHiBGL5k/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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