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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaa9b934dde0a0a9f85f294c7caa2c475ba7ef95f1250bfa944067a62c46333' 
  AND token = '/yQXPTgxkhzIs/FF9Z4UaOjLrUruaXfJYkHgp2YrweE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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