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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671ac18304fa0e3e185dbd34ac91bc4400b644bb0d06e41f0799fe8fb1d96f95' 
  AND token = '2fRSUkVg1aGG7V9SIiwF+LE6vIJqTAr6pP5oun6RVl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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